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+---
+title: Content-Length
+slug: Web/HTTP/Headers/Content-Length
+tags:
+  - 超文本传输协议
+  - 首部
+translation_of: Web/HTTP/Headers/Content-Length
+---
+<div>{{HTTPSidebar}}</div>
+
+<p><strong><code>Content-Length</code></strong> 是一个实体消息首部，用来指明发送给接收方的消息主体的大小，即用十进制数字表示的八位元组的数目。</p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">Header type</th>
+   <td>{{Glossary("Entity header")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">{{Glossary("Forbidden header name")}}</th>
+   <td>yes</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">Content-Length: &lt;length&gt;
+</pre>
+
+<h2 id="指令">指令</h2>
+
+<dl>
+ <dt>&lt;length&gt;</dt>
+ <dd>消息的长度，用十进制数字表示的八位字节的数目。</dd>
+</dl>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Title</th>
+  </tr>
+  <tr>
+   <td>{{RFC("7230", "Content-Length", "3.3.2")}}</td>
+   <td>Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("http.headers.Content-Length")}}</p>
+
+<h2 id="相关内容">相关内容</h2>
+
+<ul>
+ <li>{{HTTPHeader("Transfer-Encoding")}}</li>
+</ul>